​Background

Oregon’s noxious weed quarantine, OAR 603-52-1200, was
amended in 2009 as it pertains to butterfly bush (Buddleja
davidii /variabilis). As a result, only Oregon Department of Agriculture (ODA)
approved seedless butterfly bush cultivars can be propagated, transported, or
sold in Oregon. ODA, in cooperation with Oregon State University (OSU), has
developed a criteria and process to approve sterile cultivars of butterfly
bush. Cultivars that produce less than two percent viable seeds will be placed on
the ODA approved list. In some cases, enough data may already be available from
creditable studies for ODA to approve the cultivar. In other cases, additional
field studies may be necessary to approve the cultivar.

Cultivar approval

There are three options available to have your butterfly
bush cultivar approved.

Option 1. Sterility evaluation already completed. Under this
option, the candidate butterfly bush cultivar is evaluated based on a review of
the results of sterility studies already conducted. The submitter should
provide the results of independent research that addresses the following:

Field studies confirming that the candidate cultivar
produces less than two percent viable seeds

Parentage of the candidate cultivar

Ploidy level of the candidate cultivar

OSU specialist will conduct the review of the submitted
data. The cost will be $150 per hour.

Option 2. Sterility evaluation needed. Under this option
sterility is determined via grow out evaluations conducted by OSU. This evaluation process will take approximately 18 months and cost
$10,000 per cultivar.

Option 3. Confirmation of interspecific hybrids.
Interspecific hybrids of Buddleja are not regulated under Oregon’s Noxious Weed
Quarantine (OAR 603-052-1200). However, those transporting, propagating, or
selling Buddleja interspecific hybrids need to provide ODA with proof of
parentage. OSU specialist will conduct the review of the submitted data. The
cost will be $150 per hour.

ODA approved sterile Buddleja cultivars

The listed Buddleja cultivars produce two percent, or less,
viable seed and meet Oregon's standards for sterility. The transport,
propagation, and sale of the listed cultivars is approved.

Buddleja 'Asian Moon'

Buddleja 'Blue Chip'

Buddleja 'Blue Chip Jr.'

Buddleja 'Ice Chip' (Formerly 'White Icing')

Buddleja 'Inspired
Pink'

Buddleja 'Pink Micro
Chip'

Buddleja 'Purple Haze'

FLUTTERBY GRANDÉ™ Blueberry Cobbler Nectar Bush

FLUTTERBY GRANDÉ™ Peach Cobbler Nectar Bush

FLUTTERBY GRANDÉ™ Sweet Marmalade Nectar Bush

FLUTTERBY GRANDÉ™ Tangerine Dream Nectar Bush

FLUTTERBY GRANDÉ™ Vanilla Nectar Bush

FLUTTERBY PETITE™ Snow White Nectar Bush

FLUTTERBY™ Pink Nectar Bush

Non-regulated interspecific cultivars

These listed cultivars have been proven to be interspecific
hybrids through testing and laboratory analysis. They are not regulated under
Oregon's noxious weed quarantine and can be transported, propagated, and sold
within Oregon. The fertility of these cultivars has not been assessed, though
interspecific hybrids generally exhibit low fertility.

Buddleja 'Lilac Chip'

Buddleja 'Miss Molly'

Buddleja 'Miss Ruby'

Buddleja 'Miss Violet'

Resources

OAR 603-052-1200: Oregon noxious weed quarantine

Oregon Noxious Weed Policy and Classification (2016)

'A', 'B,' and 'T,' listed weeds for the state of Oregon. The State Noxious Weed List is used to prioritize activities at the state level and provide direction in the development of county weed lists that guide local control programs. This list is part of a Noxious Weed Policy and Classification System and is jointly maintained by the Oregon State Weed Board and the Noxious Weed Control Program. Document